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Code Issues 32 Releases Wiki Activity

Fixed #470 -- Added support for database defaults on fields.

Browse Source 
Special thanks to Hannes Ljungberg for finding multiple implementation
gaps.

Thanks also to Simon Charette, Adam Johnson, and Mariusz Felisiak for
reviews.
This commit is contained in:
Ian Foote
2020-11-22 22:27:57 +00:00
committed by Mariusz Felisiak
parent 599f3e2cda
commit 7414704e88
32 changed files with 1089 additions and 34 deletions
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26
docs/releases/5.0.txt
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@@ -108,6 +108,21 @@ Can now be simplified to:
per-project, per-field, or per-request basis. See
:ref:`reusable-field-group-templates`.
Database-computed default values
--------------------------------
The new :attr:`Field.db_default <django.db.models.Field.db_default>` parameter
sets a database-computed default value. For example::
from django.db import models
from django.db.models.functions import Now, Pi
class MyModel(models.Model):
age = models.IntegerField(db_default=18)
created = models.DateTimeField(db_default=Now())
circumference = models.FloatField(db_default=2 * Pi())
Minor features
--------------
@@ -355,7 +370,16 @@ Database backend API
This section describes changes that may be needed in third-party database
backends.
* ...
* ``DatabaseFeatures.supports_expression_defaults`` should be set to ``False``
if the database doesn't support using database functions as defaults.
* ``DatabaseFeatures.supports_default_keyword_in_insert`` should be set to
``False`` if the database doesn't support the ``DEFAULT`` keyword in
``INSERT`` queries.
* ``DatabaseFeatures.supports_default_keyword_in_bulk insert`` should be set to
``False`` if the database doesn't support the ``DEFAULT`` keyword in bulk
``INSERT`` queries.
Using ``create_defaults__exact`` may now be required with ``QuerySet.update_or_create()``
-----------------------------------------------------------------------------------------